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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an
embodiment of the present invention, FIG. 2 is a plan view of a dust cap, 10 is a dust cap, and 11
is a convex portion. In the figures, the same reference numerals indicate the same parts.
DETAILED DESCRIPTION OF THE INVENTION The invention relates to an improvement to the
loudspeaker, in particular to its dust cap. The speaker of the present invention uses foamed
polyethylene as the material of the dust cap and urethane foam etc., and at the time of forming
the dust cap, punching metal is used in combination on both sides of the mold and on one side of
the mold simultaneously Was done. This punched metal mesh has a convex portion on the front
of the dust cap, and large and small mechanical loss can be mixed in this part. This effect (1) k!
The purpose is to prevent deformation due to the shape surface of the dust cap by q-HrtJcX2q
and to significantly reduce the inherent distortion of the speaker. Since the conventional dust cap
is completely molded by direct pressing using a mold, a hard layer is generated on the shape
surface of the dust cap, so partial loss is small and deformation is likely to occur in the shape
surface during large shaking. Distortion is greatly increased, causing deterioration of the sound
quality. In order to solve this defect, the shape of the dust cap is thickened and the elastic force is
reinforced as a whole. In such a method, the mass of the dust character 1 is increased and the
efficiency is improved. It will be very difficult to remove the inherent distortion of the
loudspeaker because it will be reduced. (11 is a speaker yoke s (21a a center pole integrated with
the yoke, (3) is a permanent magnet, (4) is a play), t51 is a gloss '-' (6) fixed to this plate 4 "° y" s
(y) is this 8 y o)). 2) A spider that supports yl and prevents run-out. (8) is a cone paper, (9) is an
edge to support this cone paper, tlQt; the main part of the dust cap made of the above foam, this
shape surface In this part, the part has a large and small loss and serves to prevent the
deformation of the dust cap. The dust cap of the present invention prevents deformation due to
the shape surface at the time of widening, and reduces the inherent φ of the speaker, resulting
in a good sound quality improvement and a very large practical effect. Is 0